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Finding the Fourth Proportional to 611,120.40, 916,680.60 and 576,128.40

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Solution

The fourth proportional to 611,120.40, 916,680.60 and 576,128.40 is: 864,192.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,120.40 : 916,680.60 = 576,128.40 : x
  2. Step 2: Convert to fraction form
    611,120.40/916,680.60 = 576,128.40/x
  3. Step 3: Cross multiply
    611,120.40x = 916,680.60 × 576,128.40
  4. Step 4: Simplify right side
    611,120.40x = 528,125,727,389.04
  5. Step 5: Solve for x
    x = 528,125,727,389.04/611,120.40
  6. Step 6: Final answer
    x = 864,192.60

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.